负刚度阻尼在建筑结构抗震加固中的应用研究
首发时间:2019-11-01
摘要:现有结构加固方法一般通过加强结构刚度和强度提高既有结构抗震性能,提高刚度会增加结构的地震作用,会对既有建筑的基础和地基承载能力提出更高要求。采用消能减震技术可以提高结构抗震性能,同时降低结构总的地震作用,但通常需要在多个楼层中布置减震装置。针对此问题,提出利用负刚度阻尼技术的既有结构抗震加固方法,通过在少数楼层布置负刚度阻尼装置,延长结构周期,增大结构阻尼,减小结构地震作用和响应;提出了具有负刚度阻尼特征的负刚度摩擦阻尼器和半周摩擦阻尼器。理论分析和数值模拟结果表明:负刚度阻尼可以显著降低结构变形和底部剪力。性能试验表明本文提出的两类阻尼器可以实现预期阻尼特征,构造原理可行。
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Research on the application of negative stiffness damping in seismic reinforcement of building structures
Abstract:Existing structural reinforcement methods generally enhance the seismic performance of existing structures by strengthening the structural stiffness and strength, which will increase the seismic effect of the structure and put forward higher requirements on the bearing capacity of the foundation and foundation of existing buildings. The use of energy dissipation technology can improve the seismic performance of the structure and reduce the overall seismic effect of the structure. In order to solve this problem, a seismic reinforcement method of the existing structure using negative stiffness damping technology is proposed. By arranging negative stiffness damping devices in a few floors, the period of the structure can be extended, the damping of the structure can be increased, and the seismic action and response of the structure can be reduced. Negative stiffness friction dampers and half-cycle friction dampers with negative stiffness damping characteristics are proposed. The theoretical analysis and numerical simulation results show that the negative stiffness damping can significantly reduce the structural deformation and bottom shear. The performance test shows that the proposed dampers can achieve the expected damping characteristics and the construction principle is feasible.
Keywords: Seismic strengthening Energy dissipation damper Negative stiffness damping Half-cycle friction damping
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负刚度阻尼在建筑结构抗震加固中的应用研究
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